The Nuclear Renaissance: Why Hyperscalers Are Going Atomic
Microsoft, Google, and Amazon have all signed landmark nuclear power agreements in the past 18 months. The convergence of AI power demand and carbon commitments is reshaping the energy landscape around dormant and new nuclear assets.
Three of the largest cloud platforms have now signed nuclear power purchase agreements in rapid succession: Microsoft's deal to restart Three Mile Island Unit 1 with Constellation Energy, Amazon's agreement with Talen Energy tied directly to the Susquehanna plant powering its adjacent data center campus, and Google's early-stage commitment to Kairos Power's small modular reactors. None of this is coincidental — it is the clearest signal yet that AI-driven power demand has outrun what hyperscalers are willing to source from the spot grid.
The appeal of nuclear specifically, rather than incremental renewables, comes down to duration and certainty. A data center campus that needs to run at near-100% utilization for a decade cannot be matched against intermittent wind and solar without heavy storage buildouts. Nuclear offers carbon-free baseload with output that does not depend on weather, and a PPA structure that lets both sides underwrite a multi-decade capital commitment with a known counterparty and a known price.
The market has re-rated the exposed names accordingly. Constellation, sitting on the largest fleet of carbon-free generation in the country, is up over 125% on a trailing-year basis as investors price in demand visibility most utilities have never had. Talen — a much smaller, more levered independent power producer — moved even more sharply on the Amazon news, since a single contract at Susquehanna effectively de-risks a large share of its existing capacity.
The risk to this thesis is execution, not demand. Restarting a shuttered reactor like Three Mile Island involves regulatory review, recommissioning work, and a timeline measured in years, not quarters. The SMR side of the trade — Oklo, NuScale, Kairos — is earlier still: pre-revenue, pre-commercial, and dependent on first-of-a-kind projects clearing NRC licensing on schedule. We think the operating nuclear fleet is the highest-conviction way to play this theme today; the SMR names are a call option on 2030s power demand that requires patience most public-market investors don't have.